diff --git a/tests/win_sec_attr.c b/tests/win_sec_attr.c
index 6bd4f54..8478393 100644
--- a/tests/win_sec_attr.c
+++ b/tests/win_sec_attr.c
@@ -29,9 +29,9 @@
 
 #include "testutil.h"
 
-#include <AccCtrl.h>
-#include <Sddl.h>
-#include <Aclapi.h>
+#include <accctrl.h>
+#include <sddl.h>
+#include <aclapi.h>
 
 /*  Windows only. Custom SECURITY_ATTRIBUTES on a socket. */